Effect of acid hydrolysis conditions on the degradation properties of cellulose from Imperata brasiliensis fibers

被引：14

作者：

de Carvalho Benini, Kelly C. C. ^{[1
]}

Pereira, Paulo H. F. ^{[1
]}

Cioffi, Maria Odila H. ^{[1
]}

Cornelis Voorwald, Herman Jacobus ^{[1
]}

机构：

[1] Unesp Sao Paulo State Univ, Dept Mat & Technol, Ariberto Pereira da Cunha 333, Sao Paulo, Brazil

来源：

3RD INTERNATIONAL CONFERENCE ON NATURAL FIBERS: ADVANCED MATERIALS FOR A GREENER WORLD, ICNF 2017 | 2017年 / 200卷

基金：

巴西圣保罗研究基金会;

关键词：

Thermal analysis; Activation energy; Imperata brasiliensis fibers; NANOCRYSTALS;

D O I：

10.1016/j.proeng.2017.07.035

中图分类号：

TB3 [工程材料学]; TS1 [纺织工业、染整工业];

学科分类号：

0805 ; 080502 ; 0821 ;

摘要：

The thermal properties of Imperata brasiliensis fibers and cellulose nanofibrils (CNFs), obtained at different conditions of sulfuric acid hydrolysis, were studied in the present work. Imperata Brasiliensis fibers were chemically treated by alkaline solution followed by bleaching treatment and both, untreated and treated fibers were characterized. Using a design of experiments (DOE), CNFs were obtained at nine different conditions, considering four factors (acid concentration, pulp/solution ratio, temperature and reaction time), at three levels. From results of thermogravimetric analysis (TGA), it was possible to determine some degradation properties and kinetic parameters such as activation energy (Ea) and understand how this parameter changes as a function of chemical treatments and acid hydrolysis conditions. Considering obtained results, it was possible to stablished that chemical treatments, carried out before acid hydrolysis, were effective since some amorphous components were removed, which was confirmed by the increase of thermal stability and Ea values. The best conditions of acid hydrolysis to obtain CNFs from Imperata brasiliensis fibers was also determined, being H2SO4 64 (wt%) at 35 degrees C for 75 min with pulp/solution ratio of 1/20 (g/mL). The suspension obtained at these conditions presented initial degradation temperature of 117 degrees C and, Ea for the main stage of cellulose degradation of about 64 kJ/mol. (C) 2017 The Authors. Published by Elsevier Ltd.

引用

页码：244 / 251

页数：8

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